diff --git a/docs/source/demo_type_annotation.ipynb b/docs/source/demo_type_annotation.ipynb
index 258e0a0e80aef75660c0c74a892e9cf2b59693e9..e4138698f64b84b3bddd93e1ff2313c3d16741a9 100644
--- a/docs/source/demo_type_annotation.ipynb
+++ b/docs/source/demo_type_annotation.ipynb
@@ -67,6 +67,28 @@
     "- Any表示任意类型"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "3b323abd-7689-4abd-aa02-049b1de7bfcb",
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "NameError",
+     "evalue": "name 'Optional' is not defined",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
+      "Cell \u001b[0;32mIn[3], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m x0: Optional[\u001b[38;5;28mint\u001b[39m] \u001b[38;5;241m=\u001b[39m \u001b[38;5;28;01mNone\u001b[39;00m\n",
+      "\u001b[0;31mNameError\u001b[0m: name 'Optional' is not defined"
+     ]
+    }
+   ],
+   "source": [
+    "fx0: Optional[int] = None"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "4906826b-2817-4a5b-b3ac-a993fa96b315",
@@ -80,7 +102,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "id": "d93f8b14-5f88-4579-a671-1693d04ce144",
    "metadata": {},
    "outputs": [],
@@ -92,7 +114,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "id": "14b83562-b6c6-4873-8936-ad9d0c9c0e6f",
    "metadata": {},
    "outputs": [],